Dust arrester for blast furnaces



0d. 12, 1948. R. M. MOKELVEY Q I 2,450,976

DUST ARRESTER FOR BLAST FURNACES Filed Oct. 3, 1945 I4 16 a I3 f INVENTOR.

ATTORNEYB Patented Oct. 12, 1948 v Reuben M. Mcldelvey, Johnstown, Pa. Application October 3, 1945, Serial N0. 620,101

The invention relates to ablast furnace salvag- 3 Claims. (Cl. 266-31) ing attachment or top, and more especially to a stock salvaging and safety device fora forced draft stack or bleeder of shaft or blast furnaces.

The primary object of the invention is the provision of a device of this character, wherein on installation there will be a salvaging of approximately 95% of material otherwise lost in blast furnaces, eliminating cleaning up labor expense and resultant shutting down of the furnaces for this cleaning operation, and an increase in production.

Another object of the invention is the provision of a device of this character, wherein safety is assured from failing material due to explosions, and the life of the stack is materially increased,

' as well as a reduction in repair expense thereto.

* A further object of the invention is the provision of a device of this character, wherein the clogging of a stack is avoided; and damage thereto eliminated or reduced to a minimum.

A still further object of the invention is the provision of a device of this character, which is simple in construction, thoroughly reliable and efficient in operation, strong, durable, automatic in the working thereof, possessed of few parts,

thus economical in repairs, readily accessible for replacements, and inexpensive to and install.

with these and other objects in view the invention consists in the features of construction, combination, and arrangement of parts as will be hereinafter more fully described, illustrated in the accompanying drawing, which discloses the preferred embodiment of the invention, and pointed out in the claimshereunto appended.

Inthe accompanying drawing, the view is an manufacture elevation. partly broken away, of the device constructed ln' accordance with the invention.

Referring to the drawing in detail, A designates genera-1127" the blast furnace top constructed in dom iir head no, having upstanding Orr-set stacksirii rising therefrom and communicating with the off-takes 12 of the head III, while intermediate with relation to the rise of these stacks II is a receiving tank or drum l3 having the bracket connections II with such stacks, which are vertically aligned and in parallelism with each other.

Crowning the uppermost open ends of the stacks H are substantially concave-convex shaped caps llhaving communication with upwardly divergent i'unnels l6, each tapering in a downward di- "rection following the-incline disposition thereof,

' accordance with the invention and comprises a' mally open to receive material and adapted to be closed when bell shaped valve 26 is opened to discharge material from the tank l3 to the furnace thereby preventing heat and gases from escaping. Therefore valve 26 is counterweighted and normally closed while valve 19 is normally open. The funnels l6 at their uppermost larger ends are provided with outlets 20 protected by storm guards 2| overhanging the same.

The tank or drum l3 at its bottom is provided with a hopper 22 which has a central valve seati'ng nipple 23 for a flue 24 forming .a discharging spout leading exteriorly of the furnace, so that material collected within the tank or drum ll can be dispensed therefrom through such spout in the working of the device A.

Engaging the seat 25 within the nipple 23 is a bell shaped valve 26 counterweighted at 21.

'Ilhe uppermost open ends of the stacks I I have associated therewith flap likebaflles 26 which are confined within the caps -l 5, as will be clearly apparent from the drawing. The baflles 28 are normally seated and are unseated by furnace pressure.

In the working of the deuice it will salvage about of material otherwise lost if used in connection with a blast furnace, and results in about 95% saving of lost material; %safet-y from falling material; 90% of clean up labor, and

' so to 50% increased production, this being effected by saving in shutdowns to clean up materials that otherwise are deposited on the furnace tops and surrounding spaces thereto. The device is usable on any force draft stack that throws out materials. The essence of the device is to have the escaping materials hit the stack caps and be directed downwardinto the funnels and to the tank or drum, while at the same time pressure is reduced by expansion and allowed to escape from the stack caps and over the funnels.

What is claimed is:

1. A device of the kind described, comprising a plurality of furnace top stacks, a receiving within said caps, a discharging spout leading from the tank, valves controlling communications between the funnels and the tank and the latter and the spout respectively, and storm guards for the escape outlets.

3. A device of the kind described, comprising a plurality of Iumace top stacks, a receiving tank intermediate of the stacks, funnels establishing communications between the stacks and tank, caps crowning the communications between the stacks and tunnels and having escape outlets,

flap-like baiiles at the tops of said stacks confined within said caps, a discharging spout leading from the tank, valves controlling communications between the tunnels and the tank and the latter and the spout respectively, storm guards for the escape outlets, and means counterweighting the valve controlling the communication between the tank and the spout.

REUBEN M. 'MCKELVEY.

REFERENCES CITED The following references are of record in the iile of this patent:

UNITED STATES PATENTS Number Name Date 1,335,494 Haig Mar. 80, 1920 1,906,680 Weidlein May 2, 1933 20 2,040,532 Rice May 12. 1986 

